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Thread: 4:88s, not so popular, but gonna try it

  1. #11
    Hooked darrenroos's Avatar
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    I have 5.13 on my JK with 35s and love how it rides on the trail and on the road. With the 8 speed of the JL and 37s I would think that it would be a good option.


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  2. #12
    Nothing but a Thing
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    Quote Originally Posted by NFRs2000NYC View Post
    So you're saying 5.13s will bring a 37" wrangler closer to the performance of a stocker on 410s? No concerns over a weaker pinion due to the size?
    That's my opinion yes.

    If you look at the pinion size still on 5.13s I wouldn't be worried.

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  3. #13
    Administrator wayoflife's Avatar
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    Quote Originally Posted by 13_gecko_rubi View Post
    That's my opinion yes.

    If you look at the pinion size still on 5.13s I wouldn't be worried.

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    Agreed. Even on a JK, 5.13's were fine in a 44. Not so much in a 30.

  4. #14
    Knows a Thing or Two GrayBeard's Avatar
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    Update, Spicer gears and Rancho Front Diff Skid arrived today. Install is set for Jan 7th. I'll keep ya posted.

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    2018 Jeep JLUR, Granite Crystal Metallic, Automatic, 2" Mopar Suspension Lift, 37x12x17 Toyo Open Country R/T Tires.

  5. #15
    Caught the Bug Hooligan_JL's Avatar
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    I will have 37ís soon and also pull a 3,000 pound expedition trailer. Very interested to know how things work out for you. I wasnít planning on regearing as everything Iíve read seems to indicate that the 8 speed can handle it very well. Please update once done.


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  6. #16
    Hooked
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    We are running 5.13 & 37" Cooper's. Around town there is lots of hills, it never see's 8th. Mainly 1-6. Oh the highway it down shifts awfully early from 8 to 7 on the slightest grade.

    If a person wants see 8th even on slightest grade you would go 5.38.

    If I could regear again, I would go 37" & 5.38.

    Here is your ratio & tire comparison to stock

    IMG_2561.jpg


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  7. #17
    Nothing but a Thing
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    Quote Originally Posted by Jesse_01 View Post
    We are running 5.13 & 37" Cooper's. Around town there is lots of hills, it never see's 8th. Mainly 1-6. Oh the highway it down shifts awfully early from 8 to 7 on the slightest grade.

    If a person wants see 8th even on slightest grade you would go 5.38.

    If I could regear again, I would go 37" & 5.38.

    Here is your ratio & tire comparison to stock

    IMG_2561.jpg


    Sent from my iPhone using JL Wrangler Jeep Forum mobile app
    Ya if I were to do it myself I would do same and go to 5.38s. In future may have to do fabbed 9s on the JL just so i can get into the 6.xx ratios for 40s :-)

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  8. #18
    Administrator wayoflife's Avatar
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    I'm sure it's just me and based on personal experience but I would never run 5.38's in a 44. The numbers may be right but the pinion is just too small or at least, for my taste and from what I have seen.

  9. #19
    Administrator wayoflife's Avatar
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    I'm sure it's just me and based on personal experience but I would never run 5.38's in a 44. The numbers may be right but the pinion is just too small or at least, for my taste and from what I have seen.

  10. #20
    Administrator wayoflife's Avatar
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    I should also note that of the JL's I've seen running 5.38's and 40" tires, none have seemed to perform that great. I don't know if it's a shift point issue or what but for instance, Tom from PSC was having a hell of a time keeping up, even on the highway when climbing grades. I could literally hear his JL bogging down and then hunt for gears all the time. Granted, he was running heavier axles and pushing 40's but I would have thought the 5.38's would have more than made up for the difference. It was almost as if he were running an old JK with a 3.8L - ask me how I know.

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